I'm trying to understand the etymology for definition 3 (to rebut) below in 駁 - Wiktionary. Yellowbridge:
Han character
駁 (radical 187, 馬+4, 14 strokes, cangjie input 尸火大大 (SFKK), four-corner 74340, composition ⿰馬爻)
豹 (OC *preːwɢs, “leopard”) is its exopassive derivative, literally meaning, "the spotted one".
Definitions
I don't understand how 馬 or definition 1 (variegated horse's fur) relates to definition 3. So I looked up 爻 - Wiktionary, but I also don't understand how the I Ching's hexagram relates. I'm too addled to continue!